A federal judge has agreed to reduce by six months the amount of time former Hono­lulu police officer Michael Steven Chu must spend under court supervision.

Chu, 44, pleaded guilty in 2012 to conspiring to grow and possess marijuana to distribute.

U.S. District Judge Susan Oki Mollway sentenced Chu in January 2013 to eight months in jail followed by two years of court supervision. Mollway later reduced the jail term to seven months because she said she made a calculation error when she handed down the eight-month sentence.

Chu completed his jail term in November last year and has completed more than half of his two-year period of supervised release.

Earlier this month, his lawyer asked Mollway to end the court supervision in part because he continued to assist the government after he was sentenced.

The federal prosecutor agreed that Chu should be rewarded for his post-sentencing assistance.

Chu also told the government that he had unauthorized contact with his co-defendant girlfriend, Athena Sui Lee, after they had both pleaded guilty and were awaiting sentencing.

Mollway agreed Tuesday to shorten Chu’s period of supervised release by six months. She refused to end Chu’s supervised release completely because she said had she known about Chu violating the terms of his pre-sentence release by contacting Lee, she would have handed down a longer sentence.

Chu admitted that he and Lee grew marijuana in Lee’s Kapiolani Boulevard apartment and his rented Mililani Mauka home for distribution.